MTX floating discs are made from two segments of stainless steel which are riveted together to allow the outer section of stainless steel to expand under extreme temperatures. The outer section is manufactured from Japanese SUS 420 stainless steel then heat-treated to HRC 36+-2 while the centre of the disc is manufactured from steel or alloy. Fits: Yamaha FZ1N FAZER 2006-2016 FZ1S FAZER 2007-2016 MT01 2007-2015 YZF R1 2004-2006